Updated the Capturing procotol in the Recording package target to pass captured audio as a file URL instead of data.

Packages/Features/Sources/Recording/Protocols/Capturing.swift

@@ -19,7 +19,7 @@ public protocol Capturing: Sendable {
 
     /// Stops the recording.
     ///
-    /// - Returns: The audio captured since the recording started.
+    /// - Returns: The location of the audio file captured since the recording started.
-    func stop() async throws -> Data
+    func stop() async throws -> URL
 
 }

Packages/Features/Sources/Recording/Protocols/Transcribing.swift

@@ -8,14 +8,14 @@ public protocol Transcribing: Sendable {
 
     // MARK: Methods
 
-    /// Transcribes the given recorded audio into text, letting the service be called directly as a function.
+    /// Transcribes the given recorded audio file into text, letting the service be called directly as a function.
     ///
     /// - Parameters:
-    ///   - audio: The recorded audio to transcribe.
+    ///   - audio: The location of the recorded audio file to transcribe.
     ///   - locale: The locale of the spoken language to transcribe.
     /// - Returns: The transcription of the recorded audio.
     func callAsFunction(
-        _ audio: Data,
+        _ audio: URL,
         locale: Locale
     ) async throws -> Transcription
 

Packages/Features/Sources/Recording/Services/AudioCapturing.swift

@@ -2,7 +2,7 @@ import AVFoundation
 
 /// The recording service that captures real audio from the device's microphone.
 ///
-/// The service records into a temporary `.m4a` file through an `AVAudioRecorder`, and returns the file's contents when the recording stops.
+/// The service records into a temporary `.m4a` file through an `AVAudioRecorder`, and returns the file's location when the recording stops.
 /// The user's permission to record is requested before a recording starts and, on the platforms that require it, the shared audio session is
 /// configured for recording while the capture is in progress.
 @MainActor
@@ -73,12 +73,11 @@ public final class AudioCapturing: Capturing {
         }
     }
 
-    /// Stops the recording, deleting the temporary audio file after its contents are read.
+    /// Stops the recording, handing the temporary audio file over to the caller, which becomes responsible for deleting it.
     ///
-    /// - Returns: The audio captured since the recording started.
+    /// - Returns: The location of the audio file captured since the recording started.
-    /// - Throws: ``AudioCapturingError/noOngoingRecording`` when no recording is in progress, or any error thrown
+    /// - Throws: ``AudioCapturingError/noOngoingRecording`` when no recording is in progress.
-    /// while reading the recorded audio file.
+    public func stop() async throws -> URL {
-    public func stop() async throws -> Data {
         guard let recorder else {
             throw AudioCapturingError.noOngoingRecording
         }
@@ -91,11 +90,7 @@ public final class AudioCapturing: Capturing {
         try? AVAudioSession.sharedInstance().setActive(false)
         #endif
 
-        defer {
+        return Constant.File.url
-            try? FileManager.default.removeItem(at: Constant.File.url)
-        }
-
-        return try Data(contentsOf: Constant.File.url)
     }
 
 }

Packages/Features/Sources/Recording/Services/AudioTranscribing.swift

@@ -3,10 +3,10 @@ import Speech
 
 /// The transcribing service that transcribes recorded audio into text on device.
 ///
-/// The service writes the recorded audio into a temporary `.m4a` file and runs it through a `SpeechAnalyzer` with a `SpeechTranscriber`
+/// The service runs the given recorded audio file through a `SpeechAnalyzer` with a `SpeechTranscriber` module, joining the finalized
-/// module, joining the finalized results into the returned transcription. The transcription happens in the locale given at each call — or rather in the
+/// results into the returned transcription. The transcription happens in the locale given at each call — or rather in the closest equivalent
-/// closest equivalent the transcriber supports. The speech model assets for that locale are downloaded and installed on first use; every
+/// the transcriber supports. The speech model assets for that locale are downloaded and installed on first use; every transcription after
-/// transcription after that happens entirely offline.
+/// that happens entirely offline.
 public struct AudioTranscribing: Transcribing {
 
     // MARK: Initializers
@@ -16,22 +16,20 @@ public struct AudioTranscribing: Transcribing {
 
     // MARK: Methods
 
-    /// Transcribes the given recorded audio into text, deleting the temporary audio file when the transcription finishes.
+    /// Transcribes the given recorded audio file into text, deleting the file when the transcription finishes.
     ///
     /// - Parameters:
-    ///   - audio: The recorded audio to transcribe.
+    ///   - audio: The location of the recorded audio file to transcribe.
     ///   - locale: The locale of the spoken language to transcribe.
     /// - Returns: The transcription of the recorded audio.
     /// - Throws: ``AudioTranscribingError/localeNotSupported`` when the transcriber supports no equivalent of the given locale,
     /// or any error thrown while installing the speech model assets, reading the audio file, or analyzing its contents.
     public func callAsFunction(
-        _ audio: Data,
+        _ audio: URL,
         locale: Locale
     ) async throws -> Transcription {
-        try audio.write(to: Constant.File.url)
-
         defer {
-            try? FileManager.default.removeItem(at: Constant.File.url)
+            try? FileManager.default.removeItem(at: audio)
         }
 
         guard let locale = await SpeechTranscriber.supportedLocale(
@@ -55,7 +53,7 @@ public struct AudioTranscribing: Transcribing {
             text += String(result.text.characters)
         }
 
-        let file = try AVAudioFile(forReading: Constant.File.url)
+        let file = try AVAudioFile(forReading: audio)
 
         if let lastSampleTime = try await analyzer.analyzeSequence(from: file) {
             try await analyzer.finalizeAndFinish(through: lastSampleTime)
@@ -75,14 +73,3 @@ public enum AudioTranscribingError: Error {
     /// The transcriber supports no equivalent of the locale the transcription was requested with.
     case localeNotSupported
 }
-
-// MARK: - Constants
-
-/// The constant values used across the audio transcribing service.
-private enum Constant {
-    /// The file constants.
-    enum File {
-        /// The location of the temporary file the recorded audio is written into for the analysis.
-        static let url = FileManager.default.temporaryDirectory.appending(path: "transcription.m4a")
-    }
-}

Packages/Features/Sources/Recording/Services/DummyCapturing.swift

@@ -19,9 +19,20 @@ struct DummyCapturing: Capturing {
 
     /// Simulates the stop of a recording.
     ///
-    /// - Returns: An empty audio payload.
+    /// - Returns: The location of a dummy audio file, which is never actually created.
-    func stop() async throws -> Data {
+    func stop() async throws -> URL {
-        .init()
+        FileManager.default.temporaryDirectory.appending(path: Constant.File.name)
     }
 
 }
+
+// MARK: - Constants
+
+/// The constant values used across the recording services.
+private enum Constant {
+    /// The file constants.
+    enum File {
+        /// The name of the dummy audio file.
+        static let name = "dummy.m4a"
+    }
+}

Packages/Features/Sources/Recording/Services/DummyTranscribing.swift

@@ -11,11 +11,11 @@ struct DummyTranscribing: Transcribing {
     /// Simulates the transcription of the given recorded audio with a two-second delay.
     ///
     /// - Parameters:
-    ///   - audio: The recorded audio to transcribe.
+    ///   - audio: The location of the recorded audio file to transcribe.
     ///   - locale: The locale of the spoken language to transcribe.
     /// - Returns: A dummy transcription.
     func callAsFunction(
-        _ audio: Data,
+        _ audio: URL,
         locale: Locale
     ) async throws -> Transcription {
         try await Task.sleep(for: Constant.Delay.transcribing)

Packages/Features/Tests/Recording/Mocks/CapturingMock.swift

@@ -0,0 +1,48 @@
+import Foundation
+import Recording
+
+/// A recording service that records its invocations in call order, each one taking a configurable amount of time, and can be
+/// configured to fail.
+@MainActor
+final class CapturingMock: Capturing {
+
+    /// The duration every method takes before returning, simulating slow capture work.
+    var delay: Duration = .zero
+
+    /// The error the service throws from every method, or `nil` when it should succeed.
+    var error: Error?
+
+    /// The names of the methods called on the service, in call order.
+    private(set) var calls: [String] = []
+
+    func start() async throws {
+        try await called("start")
+    }
+
+    func pause() async throws {
+        try await called("pause")
+    }
+
+    func resume() async throws {
+        try await called("resume")
+    }
+
+    func stop() async throws -> URL {
+        try await called("stop")
+
+        return FileManager.default.temporaryDirectory.appending(path: "mock.m4a")
+    }
+
+    private func called(
+        _ name: String
+    ) async throws {
+        calls.append(name)
+
+        try await Task.sleep(for: delay)
+
+        if let error {
+            throw error
+        }
+    }
+
+}

Packages/Features/Tests/Recording/Mocks/ErrorMock.swift

@@ -0,0 +1,2 @@
+/// An error to configure the service mocks with.
+struct ErrorMock: Error {}

Packages/Features/Tests/Recording/Mocks/TranscribingMock.swift

@@ -0,0 +1,30 @@
+import Foundation
+import Recording
+
+/// A transcribing service with a configurable delay, output, and failure.
+@MainActor
+final class TranscribingMock: Transcribing {
+
+    /// The duration of the simulated transcription work.
+    var delay: Duration = .seconds(0.2)
+
+    /// The error the service throws, or `nil` when it should succeed.
+    var error: Error?
+
+    /// The transcription the service returns.
+    var transcription = "This is a mocked transcription."
+
+    func callAsFunction(
+        _ audio: URL,
+        locale: Locale
+    ) async throws -> Transcription {
+        try await Task.sleep(for: delay)
+
+        if let error {
+            throw error
+        }
+
+        return .init(text: transcription)
+    }
+
+}

Packages/Features/Tests/Recording/View Models/RecordingViewModelTests.swift

@@ -436,79 +436,3 @@ private extension RecordingView.Model {
     }
 
 }
-
-// MARK: - Mocks
-
-/// A recording service that records its invocations in call order, each one taking a configurable amount of time, and can be
-/// configured to fail.
-@MainActor
-private final class CapturingMock: Capturing {
-
-    /// The duration every method takes before returning, simulating slow capture work.
-    var delay: Duration = .zero
-
-    /// The error the service throws from every method, or `nil` when it should succeed.
-    var error: Error?
-
-    /// The names of the methods called on the service, in call order.
-    private(set) var calls: [String] = []
-
-    func start() async throws {
-        try await called("start")
-    }
-
-    func pause() async throws {
-        try await called("pause")
-    }
-
-    func resume() async throws {
-        try await called("resume")
-    }
-
-    func stop() async throws -> Data {
-        try await called("stop")
-
-        return .init()
-    }
-
-    private func called(
-        _ name: String
-    ) async throws {
-        calls.append(name)
-
-        try await Task.sleep(for: delay)
-
-        if let error {
-            throw error
-        }
-    }
-
-}
-
-/// A transcribing service with a configurable delay, output, and failure.
-@MainActor
-private final class TranscribingMock: Transcribing {
-
-    /// The duration of the simulated transcription work.
-    var delay: Duration = .seconds(0.2)
-
-    /// The error the service throws, or `nil` when it should succeed.
-    var error: Error?
-
-    /// The transcription the service returns.
-    var transcription = "This is a mocked transcription."
-
-    func callAsFunction(_ audio: Data, locale: Locale) async throws -> Transcription {
-        try await Task.sleep(for: delay)
-
-        if let error {
-            throw error
-        }
-
-        return .init(text: transcription)
-    }
-
-}
-
-/// An error to configure the service mocks with.
-private struct ErrorMock: Error {}